The pull ring is the core component of the hand pull ring, which is held and operated by people in the form of a handle or grip, and is connected to the lock body. The lock body is a metal or alloy component installed on the door, used to fix and support the pull ring, as well as to receive the up and down pulling of the pull ring. The lock cylinder is a key component of the hand pull ring, which can be operated to achieve the function of opening and closing the door lock. The principle of the hand pull ring – The principle of the hand pull ring is mainly achieved through the design of the lock body and lock core. The lock body generally consists of two main parts, the upper body and the lower body. The upper and lower body are connected by a hinge, allowing the pull tab to be pulled up and down vertically.